岗瓦碱是北京市东南郊一种碱化土壤,其主要特性是:地表灰白,多呈不规则的斑状分布;土壤可溶性含盐量低,而pH值高。由于碱化的结果,土壤干时坚硬,湿时泥泞,容重大,通透性差,保墒能力低。在生产上表现为,播种后遇雨板结难以出苗,即使出苗,前期生长 Vat base is an alkalized soil in the southeastern suburbs of Beijing. Its main features are: the surface is gray and mostly irregular patchy distribution; the soluble salt content is low and the pH is high. As a result of alkalization, the soil dry hard, wet muddy, large capacity, poor permeability, low moisture capacity. In the production of performance, after sowing Yu Banjie difficult to emerge, even if the emergence of pre-growth